Two experiments are reported which test the hypothesis that multiple sources of displayed information should be presented to common rather than separate resources when those sources must be integrated with a single mental model of the task. One experiment requires subjects to integrate horizontal and vertical information in a simulated air traffic control task. In support of the hypothesis performance is best when both sources are presented visually, rather than bimodally. In the control experiment when the altitude and horizontal information do not need to be integrated, performance is best when bimodal presentation is used.
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